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The status for an empty login name is '' (empty), for ok -- this is
so that there is no complaint about it. But it's not ok to
continue with an empty name.

[partition] Add missing space

FIXES #1540

FIXES #1536

- Create a 16kiB buffer of zeroes
- write that out in a loop

FIXES #1535

- it's easy to miss a  in hidden subgroups and other complex
  groups configurations, so complain loudly.

- don't blank out the text in the progress bar if the job provides no
  message -- just leave the last message shown. FIXES #1527
  (There's no point in having more than one copy of those initcpio*
  modules, so just use the prettyName()).
- when a job starts, look for status, then description, then name so
  that **something** is shown as text in the progress bar.
- give *shellprocess* the possibility to change its own labels
  through translations in the config file. #FIXES #1528

This improves the situation for jobs that do not provide
a status: their blank status does not overwrite the status
bar, and since (previous commit) the description or name
is used to start the job if the status is empty, at least
**something** is displayed.

SEE #1528

[partition] Strip extra file after the at sign